Success stories are inspiring, but it is easier to avoid mistakes than to repeat your successes and there is a lot to be learned from failure. So why do so many corporate-startups flame out? The real reasons can be hard to uncover but these obituaries offer some nice clues. Here is my top 10 list of startup post-mortems for some of the most notable fails. If you have friends or colleagues who are starting a new business inside a large organisation, and you found one of these post-mortems useful, please share this with them.